Beam-compass.



No. 787,766. PATEN-TBD APRylS, 1905.

' R. JENSEN @L P. JUNGNIGKEL.

BEAM COMPASS.

APILIOATION FILED JAN. 3. 1905.

No. 787.766. f Patented April 1s, 1905.

UNITED STATES PATENT OFFICE.

RICHARD JENSEN AND PAUL JUNGNICKEL, OF BERLIN, GERMANY; SAID JUNGNICKEL ASSIGN OR TO SAID JENSEN.

BEAM-COMPASS.

SPECIFICATION forming part of Letters PatentNO. b787,766, dated April 18, 1905.

` Appnmiou had January 3,1905. serial No. 239,507.

To @ZZ whom, it 12mg/ con/cern: fixed leg a, which is provided with a handle s 5o Be it known that we, RICHARD J ENsEN, enfor rotating the compass, the beam c being g'ineer, and PAUL J UNGNICKEL, foreman, of 32 pivoted to this handle. The second leg I) is Dennewitzstrasse. Berlin, in the German Emso arranged as to be slid along the beam c.

pire, have invented newand useful lmprove- This latter is provided with an elbow CZ, which ments in Beam-Compasses, of which the folis bent at a right angle and is pivoted at f in 55 lowing is a clear and distinct description. a slot in the fixed leg. The elbow portion CZ This invention relates to an improved beamhas a friction fit in the slot in the fixed leg in compass for use more especially in the prepa order to maintain the beam c in operative re- Io ration of drawings on the usual drawinglation with what we term the fixed leg a.

board. Such friction fit is common in various kinds 46o It consists, like beam-Compasses heretofore of drafting and mathematical instruments.

I used. of a fixed leg, to which is secured the This connection may, however, be effected in beam carrying' the other leg; but instead of any other suitable manner. The leg carries I 5 the fixed leg being' rigidly connected with the at its upper end a socket or clip g, by means beam this latter is according to our invention of which it can be moved and .adjusted upon 65 rotatably connected with the fixed leg, so that the beam 0, and it is held firmly in position by it 'can be folded upon the said leg when it is means of the binding-'screw z. rlhe beam is desired to restore the instrument toits case further provided with a longitudinal rib or 2O or box. This hinge-like connection between feather 71: for the purpose of preventing turnthe fixed leg and the beam is at the same time ing or twisting of the leg b about the beam, 7o of such a nature that the lattercan be turned and thereby insuring the legs c and Z1 always upward to an angle of ninety degrees to enlying in the same plane. able it to take up a position perpendicular to To enable large circles to be drawn, the

the fixed leg. By means of this arrangement beam c can be lengthened by means of one or the fixed and the movable legs always remain more lengthening-beams c'. For this purpose 7 5 parallel to each other. so that most accurate the said beam a' is provided with a stem or work can be effected with this compass. shank m, adapted to fit -into a suitable aper- Means are also provided for preventing' the ture in the main beam c. The rib oi' feather movable leg turning or twisting about the of thelengthening-beamcfurthermore probeam and also means for lengthening the disjects over the stem m, whilethe rib or feather 8o tance between the legs, so as to enable large on the main beam c is shortened to a correcircles to be described. sponding extent, and said beam is provided The invention is shown by way of example with a recess at the junction of the two beams.

in the accompanying drawings, which repre- On connecting together these latter the prosent two arrangements. jecting portion of the rib on the beam c' en- 8 5 Figure l is an elevation, and Fig. 2 a plan, ters the corresponding recess in the main beam of one form of the improved beam-compass. c, and thus any turning or twisting of the Fig. 3 is asection taken on the linea; .fr of Fig. l. lengthening-beam a' is prevented.

Figxt shows',to an enlarged scale,the manner in 'In the modified form (shown in Figs. 5, 6,

which the main beam is connected to a lengthand 7) the ribs or feathers c are dispensed with 9o ening beam or bar for the purpose of extenand are replaced by a groove p, extending sion. Fig. 5 is an elevation of another form along' the beam, and for the clip or socket g of the improved beam-compass. Fig. 6 is a there is substituted a sleeve t, which com- `section taken on the line y 1/ of Fig. 5, and pletely encircles the beam 0. In the arrange- Fig.7shows in like manner to Fig. 4 the conment shown in Figs. l to 4 the fixing of the 95 nection ofthe main and the lengthening leg?) is eected by tightening up the clip g by beams of this modified form. means of the screw 7i, whereas in the arrange- The improved beam-compass consists of the ment shown in Figs. 5 to 7 this is effected by a set-screw q taking into the groove p in the beam. To facilitate the working of the device, a pin fr may be fitted in the sleeve of the movable leg and engage the groove p.

To prevent turning or twisting' of the lengthening-beam z' in the main beam c in this arrangement, the said lengthening-beam is also provided with a stem or shank m, which here, however, carries a pin o, adapted to engage in a slot n out in the main beam c.

Having now particularly described and ascertained the nature of 'our said invention and in what manner the same is to be performed, we declare that what we claim is-d 1. A compass of the class described involving a beam provided with a feather, a leg to which said beam is foldably connected, a slidable member on the beam, provided with aleg, said feather serving to prevent turning motion of the slidable member, and means to hold said slidable member in an adjusted position.

2. A compass involving a beam, a leg between the ends of which said beam is foldably connected, said leg having a handle at its upper end, a second leg, a slide movable on the beam and to which said second leg is permanently connected, and means for holding the slide in an adjusted position.

3. A compass of the class described involving a beam, a leg to which-said beam is foldably connected, a slide on the beam having, as a permanent part thereof, a leg to coperate with the first-mentioned leg, and the beam having a feather to prevent turning motion of the slide, and means independent of the `for holding the extension against turning motion.

5. A compass of the class described involving a leg, a beam connected with the leg and having an aperture, an extension provided with a reduced stem to enter said aperture, the beam and extension each having a feather in alinement longitudinally of the beam, and the beam having a recess to receive the feather of the extension, a slide movable from the beam to the extension and provided with a leg complemental to said first-mentioned leg,

said feather serving to prevent turning motion of the slide, and means to hold the slide in an adjusted position.

In testimony whereof we have hereunto set our hands in presence of two subscribing witnesses.

RICHARD JENSEN. PAUL J UNGNICKEL. Witnesses:

HENRY HAsrERJ WoLDEMAR HAUPT. 

